Today,I reboot my CentOS box,It show some errors:

An error occurred during the file system check.
Dropping you to a shell;the system will reboot
when you leave the shell.
Give root password for maintenance
(or type Control-D to continue):

I know what cause this:Yesterday, I remove one partition, but I didn’t remove it from /etc/fstab

I don’t know the root’s password.so what only I can do is clicking Ctl+D,then the system reboot.

During the boot procedure,I edit the grub boot menu, add “single” at the end of kernel line.
After editing, it look likes ” kernel /vmlinuz-2.6.18-92.1.22.el5 ro root=LABEL=/ single”

I think the system will boot into single user mode.But unfortunately,it show the same errors.

I google with “boot ignore system check”,and I find an useful article.It shows that we can
put fastboot at the end of the kernel line.

In the end it should look as follow:
kernel /vmlinuz-2.6.18-92.1.22.el5 ro root=LABEL=/ fastboot

Greate!It works.

I ssh to the server and remove the old partition from /etc/fstab

OK,the article’s URL is http://www.cyberciti.biz/faq/linux-unix-bypassing-fsck/

http://www.cyberciti.biz/ is a great website,it contains many tips on linux,also it contains many shell scripts makes your system administration work easy.You must add it to your Favorite。

Today I discovered Ketchup, a little command-line tool to manage your Linux kernel sources. If you’re one of the weirdos, who is still compiling his kernel manually for whatever reason (like I do), I can only recommend it. Ketchup nicely eases up the entire process of checking for updates and applying them to your system.

Let’s not hesitate and look at few usage examples… Want to know what’s the latest version of a particular kernel-tree?

$ ketchup -s 2.6

2.6.17.7

$ ketchup -s 2.6-mm

2.6.18-rc1-mm2

Let’s play with your kernel sources a bit. First of all, you surely want to check what version you currently got lying around…

$ cd /usr/src/linux

$ ketchup -m

2.6.17.6

Let’s assume there is a newer kernel version available and you want to download it, bunzip it, revert the old patch and apply the new one. Nothing easier than that:

# cd /usr/src/linux

# ketchup 2.6-tip

2.6.17.6 -> 2.6.17.7

Applying patch-2.6.17.6.bz2 -R

Applying patch-2.6.17.7.bz2

That’s really it. It will download the patches, revert and apply them, so all you will have to do is watch and wait

Switching to an entirely different kernel versions is just as easy:

# cd /usr/src/linux

# ketchup 2.6.16.2

Final note: If Ketchup should abort with a gpg error, then it couldn’t verify the patch’s or kernel’s signature. Either add the 2.6 public key to your keyring (this is the proper solution) or call Ketchup with an additional -G parameter (this will override signature checking). I’d suggest the former, which is really easy to do by downloading it from a public pgp server:

# gpg –keyserver wwwkeys.pgp.net –recv-keys 0x517D0F0E

Have fun compiling,

muesli

From:http://amarok.kde.org/blog/archives/199-Using-Ketchup-to-manage-your-kernel-sources.html